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Table 5 Urine and milk nitrogen (N) excretion in dairy cows fed 3 experimental diets

From: Effects of the dietary nonfiber carbohydrate content on lactation performance, rumen fermentation, and nitrogen utilization in mid-lactation dairy cows receiving corn stover

Items

Treatmentc

SEM

P-value

AH

L-NFC

H-NFC

N intake, g/d

504a

497a

451b

1.29

< 0.01

Urinary N excretion, g/d

230a

235a

191b

10.7

0.03

N excretions, % of N intake

 Urinary N

46.2

48.0

42.6

1.79

0.11

 Milk N

27.5

26.0

28.0

1.14

0.20

  1. a-bLeast squares means within a row with different superscripts differ significantly (P < 0.05)
  2. cAH = Total mixed rations containing alfalfa hay; L-NFC = Total mixed rations containing corn stover with a low content of non-fiber carbohydrates; H-NFC = Total mixed rations containing corn stover formulated to have similar non-fiber carbohydrate concentrations as the AH diet